This was the #1 reason I went back to iPhones after a foray into Android world.
It was a massive ball-ache. You’d think it would be a simple as dropping the files onto the card, but because of the way Android is sandboxed now I couldn’t get anything to read/use those files. You had to import into the media library using some crappy desktop software.
Could well have been – it was a Sony. I never could find out where to drop the music so it was automagically picked up by the Walkman app.
I didn’t have this issue. I’ve got a Sony Xperia T & just created a folder on the SD card called ‘Music’, dragged all the files from my laptop to that location & the Walkman app finds it no problem.
It also finds music in other locations, so it not like I did anything special. The Walkman app just trawls through folders looking for music folders.
Bloke at work has got an Xperia Z3 compact & did the same thing, which also works fine; I know because he asked me how I stored music on my phone (he knew I had a Sony) and I told him what I did. He’s done the same and it’s fine.